Solids from large bore rifles are all about penetration, and breaking heavy bones such that the bone shards do most of the soft tissue damage.
Ever seen a deer shot with a 7mmMag, with a 8" exit wound? Most of that damage was caused by bone shards becoming secondary projectiles, cutting as they transit the tissue from the kinetic energy of the bullet impacting bone at 2,800+ fps.
The heavy large bore slugs are very strongly constructed, so as to not deform, or destabilize after hitting hard (or soft tissue, for that matter), so as to penetrate deeply, in a straight line. The flat tip solids actually do better than the traditional blount round-nose bullets. Military pointed solids are actually intended to yaw and destabilize inflicting greater soft tissue damage than if they did otherwise.
When shooting small game, the heavies often inflict less damage than small bore rifles with soft point bullets. Hence, the long used practice of taking small African game with a heavy rifle (meaning large caliber). There's not enough resistance from the thin, soft bones to get sufficient energy transfer from the bullet to do significant damage, though a humane kill is the foregone result.
It's one thing to "over kill" a small antelope, another altogether to get "jumped" by a lion, or Cape buffalo while carrying a 5.6x35R (aka .22Hornet). In the first instance, you lose some edible meat. In the second, YOU, LOSE! Edible meat!
Added; I've killed several whitetail deer with my .375Ruger. Damage is along the order of a .30/06 with a180gr bullet. Less than with 150gr bullets. However, the divots in the ground behind the deer are something to be seen! I wouldn't relish toting the 10lb .375 for a week hunting elk in Wyoming. However, I wouldn't be without it, hiking back to finish packing out the elk I shot previously shot with my 6.5lb 7mm08 or .30/06. (Rem.M-7, Colt Lt.Rifle (aka UltraLightArms).